Last night my 10-year old daughter said that she did not believe in God.

[Cecelia]

My youngest two thought "god is stupid' when they were about 7. My oldest three are more non-theists, which is mostly how we raised them to be. If you ask them "Do you believe in god?" they're more likely to say "What's God?" Though I imagine most ten year olds are on the verge of not believing in Santa anymore. (Oldest three didn't figure it out until then, or at least pretended otherwise for our benefit. While the youngest two stopped believing when they were 9. Personally had it spoiled for me when I was 4)